#include <iostream>
using namespace std;

int sum(int a,int b = 20){
    int result;
    result = a + b;
    return (result);
}

int main() {
    int a = 100;
    int b = 200;
    int ret;

    ret = sum(a,b);
    cout << "Total value is :" << ret << endl;

    ret = sum(a);
    cout << "Tow total value is :" << ret << endl;
}